Nagios Help

[raja nagios]

Hi,

I have configured Nagios on RHEL5.3.
now monitoring Linux and windows server.

when i look at MAP tab.
it is giving MAP from Nagios server to clients.But It is giving "?" mark.
Why?

How can i remove ? mark?

Instead of ? mark i want to display name of the machine.

How can i do so?

Thanks in Advance.

Raja.
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